Methane hydrates bearing synthetic sediments—Experimental and numerical approaches of the dissociation

The production of methane gas from methane hydrate bearing sediments may reach an industrial scale in the next decades owing to the huge energy reserve it represents. However the dissociation of methane hydrate in a porous medium is still poorly understood and controlled: the melting of methane hydr...

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Bibliographic Details
Published in:Chemical engineering science 2009-10, Vol.64 (19), p.4089-4100
Main Authors: Tonnet, Nicolas, Herri, Jean-Michel
Format: Article
Language:English
Subjects:
Applied sciences
Chemical and Process Engineering
Chemical engineering
Dissociation
Engineering Sciences
Exact sciences and technology
Heat and mass transfer
Heat and mass transfer. Packings, plates
Methane hydrate
Sediment core
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Summary:The production of methane gas from methane hydrate bearing sediments may reach an industrial scale in the next decades owing to the huge energy reserve it represents. However the dissociation of methane hydrate in a porous medium is still poorly understood and controlled: the melting of methane hydrate involves fluids flows and heat transfer through a porous medium whose properties evolve as the hydrate phase disappears, and is replaced (or not) by an ice phase. Mass and heat transfers can be coupled in a complex way, firstly because of the permeability changes, and secondly due to material conduction changes. In our work, mass and heat transfers have been studied both experimentally and numerically. A 2D numerical model is proposed where heat and mass transfers govern the dissociation of methane hydrate. This model has been used to design an experimental device. Experiments have been obtained and finally the model has been validated. The experimental set-up consists of five cylindrical sand packs having the same diameter but different lengths. Each experiment starts by crystallizing a hydrate phase in a porous medium. Then the hydrate is dissociated by controlling the pressure at one boundary. The kinetic of dissociation is monitored by collecting gases in ballast. Simulations and experiments demonstrate that the dissociation limiting step switches from thermal transfer to mass transfer depending on the initial permeability and conductivity of the porous medium.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2009.05.043